Every single computer has RAM, whether it's embedded into a processor or sitting on a dedicated circuit board plugged into the system, computing devices simply can't work without it. RAM is an astonishing feat of precision engineering, and yet it is manufactured in epic quantities every year. Given how super important RAM is, a proper dissection is called for.
Almost every desktop PC has one. They have billions of transistors, can use hundreds of watts of power, and can cost over a thousand dollars. They are masterpieces of electronic engineering and generate extremes in product loyalty and disdain... and yet the number of things they normally do can be counted one just one hand. Welcome to the world of graphics cards!